WIDE-FIELD IMAGING LENS AND OPTICAL IMAGE CAPTURE DEVICE FOR ELECTRONIC MOBILE DEVICES Russian patent published in 2021 - IPC G02B13/00 G02B9/60 G02B13/18 H04N5/225 

FIELD: optical devices.

SUBSTANCE: lens contains an aperture diaphragm and five lens optical elements, each with an aspherical surface. The first element has a positive optical force, the second – a negative optical force, and in its paraxial area, the surface on the object side is convex, and on the image side – concave. The third element has a positive optical power and in its paraxial area, the surface on the object side and on the image side is convex. The fourth and fifth elements have opposite optical forces. In the paraxial area of the fourth element, its surface is concave on the object side, and convex on the image side. In the paraxial area of the fifth element, its surface is convex on the object side, and concave on the image side. The ratio 1.545<n<1.743 is fulfilled, where “n” is the refractive index of each of these five elements.

EFFECT: increased image quality with a high optical resolution at a short TTL value, an aperture number < 2, and the correction of polychromatic aberrations.

25 cl, 21 dwg, 9 tbl